﻿namespace Microsoft.Web.Mvc {
    using System;
    using System.Dynamic;
    using System.Web.Mvc;
    using Microsoft.Web.Resources;

    internal class DynamicViewDataDictionary : DynamicObject {
        private readonly ViewDataDictionary _dictionary;

        private DynamicViewDataDictionary(ViewDataDictionary dictionary) {
            _dictionary = dictionary;
        }

        public object Model {
            get {
                return _dictionary.Model;
            }
            set {
                _dictionary.Model = value;
            }
        }

        public ModelMetadata ModelMetadata {
            get {
                return _dictionary.ModelMetadata;
            }
            set {
                _dictionary.ModelMetadata = value;
            }
        }

        public ModelStateDictionary ModelState {
            get {
                return _dictionary.ModelState;
            }
        }

        public TemplateInfo TemplateInfo {
            get {
                return _dictionary.TemplateInfo;
            }
            set {
                _dictionary.TemplateInfo = value;
            }
        }

        private bool GetValue(string name, out object result) {
            result = DynamicReflectionObject.Wrap(_dictionary.Eval(name)) ?? String.Empty;
            return true;
        }

        public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result) {
            if (indexes.Length != 1) {
                throw new ArgumentException(MvcResources.DynamicViewDataDictionary_SingleIndexerOnly);
            }

            string name = indexes[0] as string;
            if (name == null) {
                throw new ArgumentException(MvcResources.DynamicViewDataDictionary_StringIndexerOnly);
            }

            return GetValue(name, out result);
        }

        public override bool TryGetMember(GetMemberBinder binder, out object result) {
            return GetValue(binder.Name, out result);
        }

        public static dynamic Wrap(ViewDataDictionary dictionary) {
            return new DynamicViewDataDictionary(dictionary);
        }
    }
}
